Abstract:
A boring tool (30) mounted on the spindle (10) of a boring machine is adapted for automatically producing a first bore (12A) and measure the diameter thereof prior to boring a relatively larger second bore (12B). The tool (30) includes a computer (40) storing the values of demanded first and second diameters, and programmed to determine the difference between the measured first diameter and the demanded second diameter, this difference being added to the demanded first diameter to produce a weighted target diameter (WTD4), whereby account is taken of the cutting error due to deflection of the tool while cutting the first bore (12A). The tool (30) includes a stepper motor (38) adapted to position the cutting bit (32) of the tool (30) in accordance with demand signals from the computer (40) identifying the diameters to be cut. The computer (40) can only identify a diameter in comparative terms i.e. in terms of a number of steps of the motor (38). If a diameter is to be known in absolute terms, the diameter e.g. of the first bore (12A) is measured independently of the tool (30) by a probe temporarily mounted on the spindle (10) whereby the diameter of the bore can be determined in terms of, say, micrometers by a computer (20) provided on the machine. The probe-measured value of the diameter is transmitted to the computer (40) of the tool (30) by an optical communication link (50) to provide the latter computer (40) with a reference identifying the diameter in absolute terms.
Abstract:
Methods and apparatus to use vibration data to determine a condition of a process control device are disclosed. An example method includes collecting first vibration data from a first sensor operatively coupled to a process control device during a calibration. The example method further includes calculating an operating threshold of the process control device based on the first vibration data, and determining a condition of the process control device if second vibration data associated with the process control device collected after the calibration exceeds the operating threshold.
Abstract:
Sensors (11, 14, 16) arranged on the jig grinding machine (1-3, 6, 10) generate signals that are processed, partially displayed or transmitted to the CNC-control (21) by a central controlling and displaying device (18). Sensors (14) arranged on the workpiece (7) or its carrier detect contact with the tool, avoiding "air grinding" and ensuring an optical and acoustical tool contact display. A sensor (16) arranged on the grinding motor (1) controls the balance. A sensor (11) is secured to a reference plate (10) against which the tool (2) may be guided in order to precisely determine tool dimensions. By combining said controlling and monitoring functions in a single device, the productivity and the precision of machining operations can be considerably increased.
Abstract:
A device for sensing contact between a mechanism or device and an object, in which an accelerometer (1) is attached to a support (2) for the object, such as a sheep (3), the output signal from the accelerometer being connected to a vibration pre-amplifier (5) and then to a power amplifier (6) following which the signal is displayed on a cathode ray oscilloscope (7) or otherwise utilised to sense contact between the mechanism such as wool shearing cutters (4), and the object (3). In one form, the support may be in the form of a cradle (12) which enhances the area of contact between the sheep (3) and the support, the cradle (12) being isolated from extraneaous vibrations by means of insulating foam (13). In this embodiment, the signal transmitted through the body and sensed by the accelerometer (1) is generated by the cutter (4) although a separate sonic vibration source attached to the mechanism may be used. Where a separate source having a predetermined output frequency is utilised, a tuned beam (14) to which the accelerometer (1) is attached may be attached to the cradle (12) or to the support (2).
Abstract:
La présente invention se rapporte à un dispositif (10) de contrôle du perçage ou du fraisurage d'une pièce (11) dont la tolérance est inférieure à 50 µm, ledit dispositif (10) comportant : - un socle (12) de maintien de ladite pièce (11) et - un outil (15) commandé numériquement apte à réaliser un usinage de type alésage ou fraisure, - au moins un moyen de mesure (25) en temps réel des contraintes subies par ladite pièce (11) lors de l'usinage par l'outil (15), et - un moyen d'analyse apte à calculer la tolérance de l'alésage ou de la fraisure à l'aide des mesures des contraintes subies par ladite pièce (11) lors de l'usinage, ledit moyen d'analyse étant apte à réaliser un contrôle de qualité de l'usinage de ladite pièce (11).
Abstract:
Method for reducing milling failure in a machining tool due to coincidence between first vibrations v1 substantially caused by mutually exerted forces between the machining tool and an object being machined, and second vibrations v2 substantially caused by mechanical resonance by or in the the machining tool itself and/or one or more subsystems of the machining tool. The method comprising the steps of detecting frequencies of v1 and the frequencies of v2; determining the extent of the coincidence between the frequencies of v1 and the frequencies of v2. If the extent of coincidence between the frequencies of v1 and at least one of any of the frequencies of v2 is within a certain range, the vibration causing said coincidence between the frequencies of v1 and at least one of any of the frequencies of v2 is counteracted. To counteract said coincidence the respective frequencies of v1 and v2 one or more machining parameters may changed or relevant vibrational characteristics of the machining tool itself are changed by means of passive or active components, e.g. actuators.
Abstract:
The invention concerns a spinning facility with a process-control computer for at least one group of machines, each machine in the group being fitted with its own control unit which controls all the operations of the machine (including any auxiliaries with which the machine may be fitted). At least one communications network is provided for duplex communication between the computer and each machine in the group. In the invention, the sensors have been uprated and the programmes adapted in order to be able to indicate correlations between operating performance and the factors which influence it.
Abstract:
Systems, apparatus, and program code, and methods for monitoring the health and other conditions of the valve, are provided. An exemplary system for monitoring the condition of the gate valve includes a logic module configured to perform the operations of receiving sensor data providing an acoustic emission, vibration, and/or stream level signature and determining the level of lubricity, level of friction, level of surface degradation, and leakage rate at a gate-valve seat interface. An exemplary method for monitoring the condition of the gate valve includes receiving sensor data providing an acoustic emission, vibration, and/or stream level signature and determining the level of lubricity, level of friction, level of surface degradation, and leakage rate at a gate -valve seat interface.